package com.puff.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.puff.constant.MessageConstant;
import com.puff.constant.StatusConstant;
import com.puff.dto.DishDTO;
import com.puff.dto.DishPageQueryDTO;
import com.puff.entity.Dish;
import com.puff.entity.DishFlavor;
import com.puff.exception.DeletionNotAllowedException;
import com.puff.mapper.DishFlavorMapper;
import com.puff.mapper.DishMapper;
import com.puff.mapper.SetmealDishMapper;
import com.puff.result.PageResult;
import com.puff.service.DishService;
import com.puff.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Transactional // 由于操作多张表，因此需要加上事务注解
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO,dish);

        // 向菜品表中插入1条数据
        dishMapper.insert(dish);

        // 获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){

            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            // 向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        // 利用PageHelper分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        // 菜品分页查询给前端返回的数据类型
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        // 判断当前菜品是否能够删除 -- 是否存在起售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                // 如果是起售状态，则不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 判断当前菜品是否能够删除 -- 是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0){
            // 如果有套餐与菜品相关联，则不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除菜品表中的菜品数据
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            // 删除菜品表关联的口味数据，即dish_flavor表中的数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        // 根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);

        // 根据dishId集合批量删除菜品表关联的口味数据，即dish_flavor表中的数据
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 根据id查询菜品信息
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        // 根据id查询菜品信息
        Dish dish = dishMapper.getById(id);

        // 跟据菜品id查询口味信息
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        // 封装数据并返回
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品信息以及对应的口味信息
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        // 修改菜品基本信息
        dishMapper.update(dish);

        // 删除口味表中对应的菜品口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        // 向口味表中添加新的菜品口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });

            // 向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        // 查询的菜品需要是与categoryId相对应的，并且是在起售当中的
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        List<Dish> list = dishMapper.list(dish);
        return list;
    }

    /**
     * 起售停售菜品
     * @param status
     */
    public void startOrStopDish(Long id,Integer status) {
        Dish dish = Dish.builder()
                        .id(id)
                        .status(status)
                        .build();
        dishMapper.update(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
